Mytilarca dubia (FOSSIL) Walcott, 1884 †
Mytilarca eduliformis (FOSSIL) A.H. Clarke & Ruedemann,1903 †
Mytilarca expansa (FOSSIL) Isberg, 1934 †
Mytilarca foerstei (FOSSIL) A.H. Clarke & Ruedemann,1903 †
Mytilarca gibbosa (FOSSIL) J.W. Hall, 1884 †
Mytilarca inflata (FOSSIL) J.J.F. Whiteaves, 1892 †
Mytilarca iniqua (FOSSIL) Isberg, 1934 †
Mytilarca kallholniensis (FOSSIL) Isberg, 1934 †
Mytilarca knappi (FOSSIL) J.W. Hall, 1884 †
Mytilarca kullsbergensis (FOSSIL) Isberg, 1934 †
Mytilarca lata (FOSSIL) J.W. Hall, 1883 †
Mytilarca leptaenarum (FOSSIL) Isberg, 1934 †
Mytilarca lineatus (FOSSIL) Reed 1944 †
Mytilarca mareki (FOSSIL) Kríž & Steinová, 2009 †
Mytilarca marylandica (FOSSIL) Ohern in Ohern& C.J. Maynard, 1913 †
Mytilarca mytiliformis (FOSSIL) (J.W. Hall, 1852 †)
Mytilarca obliqua (FOSSIL) Weller, 1903 †
Mytilarca orsae (FOSSIL) Isberg, 1934 †
Mytilarca parallela (FOSSIL) Isberg, 1934 †
Mytilarca parens (FOSSIL) Barrande, 1881 †
Mytilarca percarinata (FOSSIL) R.P. Whitfield, 1882 †
Mytilarca ponderosa (FOSSIL) J.W. Hall& R.P. Whitfield, 1869 †
Mytilarca pyrimadata (FOSSIL) J.W. Hall, 1883 †
Mytilarca regularis (FOSSIL) J.W. Hall, 1883 †
Mytilarca rowei (FOSSIL) Ohern in Ohern& C.J. Maynard 1913 †
Mytilarca semicircularis (FOSSIL) Isberg, 1934 †
Mytilarca sigilla (FOSSIL) J.W. Hall, 1876 †
Mytilarca siluriana (FOSSIL) Reed, 1927 †
Mytilarca simplex (FOSSIL) J.W. Hall, 1883 †
Mytilarca suberectus (FOSSIL) Ohern in Ohern& C.J. Maynard, 1913 †
Mytilarca thorslundi (FOSSIL) Isberg, 1934 †
Mytilarca triangula (FOSSIL) Isberg, 1934 †
Mytilarca umbonata (FOSSIL) J.W. Hall, 1883 †
Mytilarca wabashensis (FOSSIL) Kindle & M. Breger,1904 †
Notonychia emmae (FOSSIL) P. Sánchez, 2001 †
Opisthoptera alternata (FOSSIL) Ulrich, 1895 †
Opisthoptera casei (FOSSIL) (F.B. Meek& A.H. Worthen, 1866 †)
Opisthoptera gouldi (FOSSIL) (Ulrich in Hussey,1926 †)
Opisthoptera griffini (FOSSIL) Hussey, 1926 †
Paramytilarca glabra (FOSSIL) Isberg, 1934 †
Paramytilarca levis (FOSSIL) Isberg, 1934 †
Paramytilarca oblonga (FOSSIL) Isberg, 1934 †
Paramytilarca oviformis (FOSSIL) Isberg, 1934 †
Paramytilarca quadrangula (FOSSIL) Isberg, 1934 †